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https://github.com/it-ebooks/industry-reports-2017-part1/raw/master/2017%E5%B9%B4%E7%AC%AC1%E5%AD%A3%E5%BA%A6%E4%B8%AD%E5%9B%BD%E7%9F%AD%E8%A7%86%E9%A2%91%E5%B8%82%E5%9C%BA%E5%AD%A3%E5%BA%A6%E7%9B%98%E7%82%B9%E5%88%86%E6%9E%90%281%29.pdf